Siren's Call [Alpha Edition] XY171 Ochre Jelly enters the battlefield

Ochre Jelly enters the battlefield with X +1/+1 counters on it

Set: Throne of Eldraine Prerelease Promos Type: Artifact Rarity: Rare Cost: {1}{B} Wishclaw Talisman enters the battlefield with three wish counters on it

They move in a synchronized swarm

Set: Commander 2019 Type: Creature — Zombie Wizard Rarity: Rare Cost: {4}{B} Whenever you discard a creature card

the Mocking Sage can't be blocked by creatures with horsemanship

Siren's Call [Alpha Edition] XY171 Ochre Jelly enters the battlefieldSet: Alpha Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy all non Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.